okay. I have two extensions: ext 24 and ext 25. The phone at ext 25 is broken so I moved the phone from extension 24 to extension 25. Went into System Programming, selected Change DN's. Change DN from 24 to 25 but phone at extension 25 still states out of service and remains ext 24. When you try to ring or transfer to ext 25, ext 24 rings on the phone instead of 25. Let me know if you need additional information.